/*просмотр картинок*/
function preview_image(url) {
    var imageWidth ;
    var imageHeight ;
    imgPreloader = new Image();
    imgPreloader.onload = function() {
        imgPreloader.onload = null;
        imageWidth = imgPreloader.width;
        imageHeight = imgPreloader.height;
    };
    imgPreloader.src = url;
    var wx = (screen.width - imgPreloader.width) / 2;
    var wy = (screen.height - imgPreloader.height) / 2;
    var wpos = "left=" + wx + ",top=" + wy;
    imageWidth = imgPreloader.width + 50;
    imageHeight = imgPreloader.height + 50;
    PopUpWin = window.open(url, "Image", "width=" + imageWidth + ",height=" + imageHeight + ",fullscreen=0,directories=0,location=0,menubar=0,resizable=1,scrollbars=1,status=0,toolbar=0," + wpos);
}

/*просмотр видео а попап окне*/
function play_video(url) {
    var h = 300;
    var w = 400;
    var wx = (screen.width - w) / 2;
    var wy = (screen.height - h) / 2;
    var wpos = "left=" + wx + ",top=" + wy;
    var wh = h +50;
    var ww = w +50;
    PopUpWin = window.open(url, "Video", "width=" + ww + ",height=" + wh + ",fullscreen=0,directories=0,location=0,menubar=0,resizable=1,scrollbars=1,status=0,toolbar=0," + wpos);
}

/*просмотр аудио а попап окне*/
function play_audio(url) {
    var h = 26;
    var w = 400;
    var wx = (screen.width - w) / 2;
    var wy = (screen.height - h) / 2;
    var wpos = "left=" + wx + ",top=" + wy;
    var wh = h+50;
    var ww = w+50;
    PopUpWin = window.open(url, "Audio", "width=" + ww + ",height=" + wh + ",fullscreen=0,directories=0,location=0,menubar=0,resizable=1,scrollbars=1,status=0,toolbar=0," + wpos);
}


/* ограникение размера текстареа */
function validate_length(id, max_length, message, error_id, error_class, error_message) {
	if ($(id).value.length > max_length) {
		$(error_id).update(error_message + ' ' + max_length).addClassName(error_class);
	} else {
		$(error_id).update(message + ' ' + (max_length - $(id).value.length)).removeClassName(error_class);
	}
}